Vulnerability affects commonly-used endpoints of Struts, which are likely to be exposed, opening up an attack vector to malicious hackers. Organizations and developers who use Apache Struts are urgently advised to upgrade their Struts components as soon as possible. Less than a year ago, Equifax exposed personal details of its 147 million consumers due to their failure of patching a similar flaw that was disclosed earlier that year (CVE-2017-5638) The Equifax breach cost the company over $600 million in losses.
Source: https://thehackernews.com/2018/08/apache-struts-vulnerability.html